If you look back 40 years, the concentration of the top 10 stocks ranged from a low of 17.5% in 2014 to a previous high of 25.5% in 1980. It's currently 27.6%

If you look back 40 years, the concentration of the top 10 stocks ranged from a low of 17.5% in 2014 to a previous high of 25.5% in 1980. It's currently 27.6% https://t.co/4Anr3Ez4jE pic.twitter.com/PEoaFwnIiK

— Bloomberg Opinion (@bopinion) August 24, 2020